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Dalli is a high performance pure Ruby client for accessing memcached servers. It uses the memcached meta protocol and requires memcached 1.6+.

Dalli supports:

• Simple and complex memcached configurations
• Failover between memcached instances
• Fine-grained control of data serialization and compression
• Thread-safe operation (either through use of a connection pool, or by using the Dalli client in threadsafe mode)
• SSL/TLS connections to memcached
• Bulk operations: set_multi, delete_multi, and pipelined get_multi
• Thundering herd protection via fetch_with_lock
• Rich metadata retrieval via get_with_metadata
• OpenTelemetry tracing with zero overhead when not enabled
• Dynamic namespaces for multi-tenant applications

The name is a variant of Salvador Dali for his famous painting The Persistence of Memory.

Dalli is published as a gem on Rubygems.